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Question: Answered & Verified by Expert
Let A and B are square matrices of order 2 such that A+adjBT=3223 and AT-adjB=-2-1-1-2, then A2+2A3+3A4+5A5 is equal to (where MT and adj(M) represent the transpose matrix and adjoint matrix of matrix M respectively and I represents the identity matrix of order 2)
MathematicsMatricesJEE Main
Options:
  • A 4A
  • B 7A
  • C 11A
  • D 10Ι
Solution:
2868 Upvotes Verified Answer
The correct answer is: 11A
Let, X=3223, Y=-2-1-1-2
A+adjBT=X
AT-adjB=Y
A-adjBT=YT
2A=X+YT=1111A=121111
2adjBT=X-YT=5335adjBT=125335
A2=1411111111=142222=121111=A
A3=A4=A5=A

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